Assume that the Indo-Greek Kingdom survives, either by having Eucratides not be assassinated (so he can complete his conquest of his rival indo-greek kingdom, ruled by Demetrius) or by giving a stabler succession to Menander/Milinda.
What are the effects on:
The connections between Europe, the Near East, and India?
The spread of buddhism?
Will there be further greek migration into the kingdom? Or must the aristocracy assimilate into the more native populace to survive?